$\lim_{x\to0}\left(\frac{\left(ln\left(x+1\right)-x\right)}{1-cos\left(3x\right)}\right)$

$32-19+43-18+35-53$

$\sec^2\left(-\frac{3\pi}{4}\right)-\csc^2\left(\frac{\pi}{3}\right)$

$x^2+30x+200$

$\frac{\left(\frac{1}{x+3}-\frac{1}{3}\right)}{x}$

$n^2-5n+9$

$sin2x-2sinx$